package com.cloud.zuul;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Component
public class TokenFilter extends ZuulFilter {
    private static Logger log = LoggerFactory.getLogger(TokenFilter.class);
    /*
    filterType：返回一个字符串代表过滤器的类型，
    在zuul中定义了四种不同生命周期的过滤器类型，具体如下：
    pre：路由之前
    routing：路由之时
    post： 路由之后
    error：发送错误调用
    */
    @Override
    public String filterType() {
        return "pre";
    }

    /*filterOrder：过滤的顺序*/
    @Override
    public int filterOrder() {
        return 1;
    }

    /*shouldFilter：这里可以写逻辑判断，是否要过滤，本文true,永远过滤。*/
    @Override
    public boolean shouldFilter() {
        return true;
    }

    /*run：过滤器的具体逻辑。可用很复杂，包括查sql，nosql去判断该请求到底有没有权限访问。*/
    @Override
    public Object run() throws ZuulException {

        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        log.info(String.format("%s >>> %s", request.getMethod(), request.getRequestURL().toString()));
//        Object accessToken = request.getParameter("token");
//        if(accessToken == null) {
//            log.warn("token is empty");
//            ctx.setSendZuulResponse(false);
//            ctx.setResponseStatusCode(401);
//            try {
//                ctx.getResponse().getWriter().write("token is empty");
//            }catch (Exception e){
//                log.warn("filter error");
//            }
//            return null;
//        }
        log.info("ok");
        return null;
    }
}
